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Etno is calm and smart, but he can also be naïve, easily annoyed and angered by the Aliens' stupidity - as they always struggle to understand his plans - and Bud's clumsiness.

He seems to be nice, quite generous and pretentious, and he is the last one to panic after the tenants come to the Aliens' house and his inventions and experiments plus their possessions are destroyed.

Despite being knowledgeable about Earth, it's quite clear that he doesn't fully understand Earth's customs and can be quite intrigue by such things. For example, he tends to be absorb in research on clowns. At times, this lead him to be very ignorant of surroundings, consequences, and situations. He is quite cultured. As he was seen enjoying classical music in one episode.

He seems to have taken half of the Aliens' house to use as his science lab in the attic. With his ability to rationalize nearly everything using his own version of logic, Etno became the scientist, overall leader and the intelligent head of the Aliens. He always has an explanation, but unfortunately he is not always correct.

In addition his scientific research, he devoteds himself into building and making various experiments, inventions and rockets with a good enough condition to get them back to their home planet, Zigma B. Unfortunately, a last-minute incident in almost every episode prevents the Aliens from returning to their home planet leaving them stranded here on Earth, forever. In fact, not every episode goes by without developing a plan though, but always end up in a failed attempt.